Merge pull request #294 from phobos182/master

builder/amazon/instance: was missing sending IAM profile data
Update CHANGELOG
builder/amazon: add block device mappings [GH-90]
website: document the amazon block device mappings
Update CHANGELOG: amazon block device mappings
common: Add new StepDownload to DRY up downloads
builder/virtualbox: switch download guest additions to use new common
builder/virtualbox: remove unused function
builder/vmware: switch to common download step
builder/virtualbox: iso_urls for multiple ISO urls [GH-110]
builder/vmware: support iso_urls for multiple URLs [GH-110]
post-processor/vagrant: use common.PackerConfig
post-processor/vagrant: process user variabels [GH-295]
packer: shuffle some tests around to where they make more sense
Allow failures on tip for Travis
packer: ConfigTemplate, move from common
common: Remove Template, in packer now
*: switch to packer ConfigTemplate
update CHANGELOG for go-fs fix that fixes [GH-285]
common: detect drive letter with windows file URLs [GH-284]